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I can't believe I keep forgetting to post this here! Home Depot has put a Zombie Mulch game on their Facebook page. The "mulch" adds up and once to get to a certain level you get a coupon for $5 off a Lawn and Garden purchase of $5.01 or more. Then there is a $10 one and finally a $15 one! They can't be combined, but that's $30 worth of seeds, trellises, etc for almost free if you divide it up right! And if someone else in your household has a Facebook account, there's another $30! Awesome deal. Game seems to work best in Chrome, but I've played it in Waterfox and IE as well.

Not sure if I can post this link, so take it out if I can't, but here's a thread explaining all the details at Slickdeals